JP2002070865A - Journal bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a journal bearing in which manufacturing is easy and a like is extended by improving retainability of lubricating oil. SOLUTION: The journal bearing 1 comprises a bush 3 and a bush 5 into which the bush 3 is press fitted. In the bush 3, a circular hole 9 and slit 11 for retaining the lubricating oil is formed on an end surface of the bush 3 so as not to open to the exterior. In the boss 5, a through-hole 17 is formed for injection of lubricating oil to the circular hole 9 and slit 11 formed in the bush 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a journal bearing used for various devices and machines having a rotating mechanism.

[0002]

2. Description of the Related Art Conventionally, journal bearings have been disclosed in Japanese Patent Application Laid-Open No. 50-128037 and Japanese Patent Application Laid-Open No. 8-326657.
Is disclosed in Japanese Unexamined Patent Application Publication No. 2000-205,878. FIG.
1 is a side sectional view showing a structure of a journal bearing disclosed in Japanese Patent Application Publication No. 0-128037. In the journal bearing 61, a plurality of solid lubricants 67 are embedded in an outer peripheral surface of a bearing base metal 65 attached to a bearing base 63. A notch 69 is formed on the outer peripheral surface of the bearing base metal 65 from the end surface to a portion where the solid lubricant 67 is embedded. The notch 69 forms a gap g between the bearing base metal and the bearing stand. In the shaft journal receiver 61, when a load is applied to a shaft (not shown), the bearing base metal 65 bends, and the solid lubricant 67 disposed opposite the notch 69 is pushed out. The solid lubricant 67 is supplied so as to be in close contact with the shaft, so that the rotation of the shaft is performed smoothly and the surface pressure distribution is made uniform.

FIG. 5 is a cross-sectional view showing the structure of a journal bearing disclosed in Japanese Patent Application Laid-Open No. 8-326557. The journal bearing 71 includes a flexible plate 77 made of a polymer material having lubricity or a flexible plate having a plurality of holes between the bearing 73 and the journal shaft 75. , Is inserted with the lubricating oil.
The plate 77 moves freely between the journal shaft 75 and the bearing 73. For this reason, even if an excessive load is applied to the journal shaft 75 and the gap between the journal shaft 75 and the bearing 73 is reduced, the journal shaft 75 and the bearing 73 do not come into direct contact with each other, but come into contact via the lubricating plate 77. Alternatively, a plurality of holes serve as a lubricant reservoir, and when a load is applied by the journal shaft 75, the lubricant comes out to the contact surface, so that the lubricity of rotation is improved.

[0004]

However, such a conventional journal bearing has the following problems.
The journal bearing disclosed in Japanese Patent Application Laid-Open No. 50-128037 has a configuration in which a solid lubricant is embedded in a bearing base metal, so that the solid lubricant is gradually consumed by lubrication of a sliding surface. When the solid lubricant is completely consumed and the supply is stopped, the bearing base metal is worn and the life of the journal bearing is shortened.

On the other hand, in the journal bearing disclosed in Japanese Patent Application Laid-Open No. 8-326557, when a lubricating and flexible plate is used, there is no hole for supplying lubricant to both surfaces of the plate. That is, since the seizure of the bearing and the journal shaft is prevented by abrading the plate material, the plate material is severely worn, and the life of the entire journal bearing is shortened. When a flexible plate having a plurality of holes is used, the supply of the lubricant may be non-uniform for each hole since the holes are not connected by a groove or the like.
For this reason, when the lubricant runs out partially, the plate material is worn, and the life of the bearing is shortened. Further, since the above-described journal bearing is manufactured by cutting out a pipe, the manufacturing operation requires time and labor.

The present invention has been made in view of the above problems, and has as its object to provide a journal bearing which is easy to manufacture, has improved lubricating oil holding properties, and has a longer life.

[0007]

In order to solve the above-mentioned problems, a journal bearing according to the present invention is a bush for rotatably supporting a journal shaft, and has a recess or a hole for holding lubricating oil. A bush formed so as not to open to the outside at the end face of the bush, and a boss into which the bush is press-fitted, wherein an injection hole for injecting lubricating oil into a recess or hole formed in the bush is formed. And a boss.

According to the present invention, the recess or hole for holding the lubricating oil is formed at the end face of the bush so as not to open to the outside, and forms the lubricating oil reservoir. Hardly leaks to the outside, and the retention of lubricating oil is improved. Furthermore, by forming an injection hole for injecting lubricating oil into a dent or a hole for retaining lubricating oil in the boss into which the bush is pressed, uniform lubricating oil can be supplied by lubricating at regular intervals. Become. As a result, seizure of the bearing and the journal shaft can be prevented, the maintenance period can be lengthened, and the life of the bearing is extended.

[0009] Here, an oil supply groove for supplying the lubricating oil injected into the injection hole of the boss to the depression or hole formed in the bush is provided on one surface of the bush or through the bush, or Preferably, it is formed on the inner surface of the boss. In that case, the injected lubricating oil can be reliably supplied to the dent or hole formed in the bush.

[0010] The bush is formed with a plurality of circular depressions or holes for holding lubricating oil and branch-like depressions or holes communicating with the plurality of circular depressions or holes. Preferably, the direction has a predetermined angle with respect to the direction of rotation of the journal shaft. In that case, the lubricating oil can be evenly supplied to the plurality of circular dents or holes for holding the lubricating oil via the branch-like dents or holes. Further, by forming the branch-like depression or hole at a predetermined angle with respect to the rotation direction of the journal shaft, the flow of the lubricating oil accompanying the rotation of the journal shaft becomes smooth, and uniform supply of the lubricating oil is achieved. improves.

In the above, the bush supplies the inner member having the recess or hole for retaining the lubricating oil to the lubricating oil injected into the injection hole of the boss to the recess or the hole formed in the inner member. May be press-fitted into an external member having an oil supply groove formed therein. As described above, by manufacturing the bush from two members, it is possible to relatively easily manufacture even a complicated shape.

In the present invention, the bush can be made from a plate-like material. That is, a pit or hole for holding lubricating oil, a branch-like dent or hole communicating with the dent or hole, and an oil supply groove for supplying lubricating oil to the dent or hole are formed in the plate-like material by punching. Alternatively, it can be formed by stamping or rolling, and rolling this plate-like material into a sleeve shape. For this reason, manufacturing becomes easy and manufacturing cost is reduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a first embodiment of the present invention.
It is a perspective view for explaining the manufacturing process of the journal bearing according to the embodiment. As shown in FIG. 1D, the journal bearing 1 includes a bush 3 and a boss 5 into which the bush 3 is press-fitted.

The bush 3, as shown in FIG.
For example, it is manufactured from a plate 7 made of steel. This plate 7
1B, a hole 9 and a slit 11 are formed by punching. In this example, 17 holes 9 each having a circular planar shape and a branch-like slit 11 communicating each circular hole 9 are formed. In the longitudinal direction of the plane of the plate 7, there are a total of 17 circular holes 9, 6 in the left column (9 a), 5 in the center column (9 b), and 6 in the right column (9 c). Is placed on top. The branch-like slit 11 includes a vertical slit 11a extending in the longitudinal direction of the plate member 7 so as to pass through the five circular holes 9b in the central row.
And six horizontal slits 11b branched into a total of twelve circular holes 9a and 9c in the left and right rows. Here, the vertical slit 11a and the horizontal slit 11b are orthogonal. With such a configuration, all the circular holes 9 and the branch slits 1 are formed.
1 communicates with the end face of the plate member 7 without opening.

It is desirable that the longitudinal direction of the vertical slit 11a has a predetermined angle with respect to the rotation direction of the journal shaft, and in the present embodiment, both are parallel. In this case, the horizontal slit 11b is perpendicular to the rotation direction of the journal shaft. When the vertical slit 11a is formed parallel to the rotation direction of the journal shaft in this manner, the acceleration generated when the journal shaft rotates and stops easily acts on the lubricating oil existing in the vertical slit 11a, and the left and right rows are formed. The lubricating oil is easily and smoothly supplied to the circular holes 9a and 9c.

Next, as shown in FIG. 1 (C), the plate 7 having the circular holes 9 and the branch slits 11 is connected to both ends of the plate 7 by using the upper plane as the outer peripheral surface of the bush 3. To form a bush 3. Therefore, the side surface of the bush 3 is circular.

As shown in FIG. 1D, the bush 3
The journal bearing 1 is formed by press-fitting the boss 6. The boss 6 includes a sleeve 13 having a through hole having an inner diameter substantially the same as the outer diameter of the bush 3, and a holding member 15 for holding the sleeve 13. A small-diameter through hole 17 is formed in the center of the outer peripheral surface of the sleeve 13 in the width direction. When the bush 3 is pressed into the sleeve 13, the through hole 17 communicates with the central hole 9b or the vertical slit 11a of the bush 3.

In this bearing 1, the lubricating oil is supplied to the boss 5
Is injected into the bush 3 through the through hole 17. The injected lubricating oil flows into the central circular hole 9b or the vertical slit 11a formed in the bush 3. The lubricating oil fills the center circular hole 9b and the vertical slit 11a, and also fills the left and right rows of circular holes 9a and 9c through the horizontal slit 11b. Thus, the lubricating oil is applied to each hole 9 and slit 1
1 to form a lubricating oil reservoir. This lubricating oil is supplied to a contact surface between a rotating shaft (not shown) inserted into the bush 3 and the inner surface of the bush 3. When the lubricating oil runs out, the lubricating oil is appropriately supplied from the through hole 17 of the boss 5. Replenishment of the lubricating oil may be performed periodically.

FIG. 2 is a perspective view for explaining a manufacturing process of the journal bearing according to the second embodiment of the present invention. The bush of the journal bearing according to the present embodiment is mainly manufactured by coining.

The bush is made of a plate 27 made of, for example, steel, as shown in FIG. FIG. 2 (B)
As shown in FIG. 1, a branch-like depression arranged in the same manner as the circular hole and the slit shown in FIG. 1B is formed on the front surface 27a of the plate material, and a central depression 33 is formed on the back surface 27b of the plate material. You. The branch-like depression includes a circular depression 29 and a slit-like depression 31. In the longitudinal direction of the plane of the plate 27, there are six circular depressions (29a) in the left row, five (29b) in the center row,
A total of 17 pieces, 6 pieces (29c) in the right column, are arranged on a straight line in each row. The slit recess 31 includes a vertical slit recess 31a extending in the longitudinal direction of the plate member 27 so as to pass through the five circular recesses 29b in the central row, and the vertical slit recess 31a.
And six lateral slit depressions 31b branched into a total of twelve circular depressions 29a and 29c in the left and right rows. Here, the vertical slit recess 31a and the horizontal slit recess 31b are orthogonal to each other. The central recess 33 extends in the longitudinal direction at the center in the width direction of the back surface 27b of the plate material. These depressions do not open at the end face of the plate material 27.

Next, as shown in FIG.
A small-diameter through hole 35 is formed by punching in the central depression 33 on the back surface 27b. In this example, five through holes 35 are formed along the longitudinal direction of the central depression 31. This through hole 35 is formed in the vertical slit recess 31 of the plate material surface 27a.
reaches a. Therefore, the circular depression 29 and the slit-shaped depression 31 formed on the front surface 27a of the plate material and the central depression 33 formed on the back surface 27b of the plate material communicate with each other through the through hole 35.

Then, the plate 27 is placed on the back surface 27b (the surface on which the central depression 33 is formed) so as to be on the outside in FIG.
A bush is produced by molding in the same manner as in (C). This bush is pressed into a boss having a through hole as in FIG.

In this bearing, the lubricating oil is injected into the bush through the through hole of the boss. The injected lubricating oil flows into the central depression 33 formed on the outer peripheral surface of the bush.
Then, while being filled in the central depression 31, the through hole 35 is formed.
, The circular recess 29 and the slit-like recess 31 on the inner surface of the plate material 27 are also filled. Thus, the lubricating oil is evenly filled in each of the circular depression 29 and the slit-shaped depression 31. This lubricating oil is supplied to the contact surface between the rotating shaft inserted into the bush and the inner surface of the bush.

By making the shape of the lubricating oil reservoir a depression as in this example, excessive consumption of the lubricating oil is suppressed as compared with the case of a hole, and the lubricating oil holding property is improved.

FIG. 3 is a perspective view for explaining a manufacturing process of a journal bearing according to a third embodiment of the present invention. Bush 43 of journal bearing according to this embodiment
Is composed of two members 45 and 47 on the inside and outside. The inside member 45 is inserted into the outside member 47 and integrated.

As shown in FIG. 3A, the inner member 45
Is a bush shown in FIG. Outer member 4
Reference numeral 7 denotes a plate member having a central recess formed on one surface as shown in FIG. 2 (B). That is, the outer member 47
A central recess extending in the longitudinal direction is formed at the center in the width direction of the plate material, and a small-diameter through-hole penetrates the central recess by punching. Then, the plate material is formed into a sleeve shape such that the surface of the plate material on which the central recess is formed is on the outside. Then, as shown in FIG. 3B, the inner member 45 is press-fitted into the outer member 47 to be integrated, and the bush 43 is manufactured.
This bush is press-fitted into a boss as in FIG. 1 (D) to form a journal bearing.

In this bearing, lubricating oil is previously injected into the bush through a through hole of the boss. The injected lubricating oil flows into a central recess formed in the outer member 47 of the bush 43. Then, while being filled in this central depression, it is also filled in all the holes of the inner member 45 through the through holes. Thus, the lubricating oil is evenly filled in each hole. This lubricating oil is supplied to the contact surface between the rotating shaft inserted into the bush 43 and the inner surface of the bush.

By manufacturing the bush from two members as in the present embodiment, the bush can be manufactured relatively easily even if it has a complicated shape.

[0029]

As is clear from the above description, according to the present invention, it is possible to provide a journal bearing which is easy to manufacture, has improved lubricating oil retention, and has a longer life.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a manufacturing process of a journal bearing according to a first embodiment of the present invention.

FIG. 2 is a perspective view for explaining a manufacturing process of a journal bearing according to a second embodiment of the present invention.

FIG. 3 is a perspective view for explaining a manufacturing process of a journal bearing according to a third embodiment of the present invention.

FIG. 4 is a side sectional view showing the structure of a journal bearing disclosed in Japanese Patent Application Laid-Open No. 50-128037.

FIG. 5 is a cross-sectional view showing a structure of a journal bearing disclosed in Japanese Patent Application Laid-Open No. 8-326557.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Journal bearing 3, 43 Bush 5 Boss 7, 27 Plate material 9 Circular hole 11 Slit 13 Sleeve 15 Holding member 17 Through hole 29 Circular recess 31 Slit-shaped recess 33 Central recess 35 Through hole 45 Inner member 47 Outer member

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Tatsu Fukuda 2-3-6 Akasaka, Minato-ku, Tokyo F-term in Komatsu Ltd. (reference) 3J011 AA07 BA02 DA02 JA02 KA02 LA04 MA03 MA05 MA06

Claims (4)

[Claims] 1. A bush for rotatably supporting a journal shaft, wherein said bush is formed such that a recess or a hole for holding lubricating oil does not open to the outside at an end face of said bush. A boss into which the bush is press-fitted, the boss having an injection hole for injecting lubricating oil into a recess or hole formed in the bush. 2. An oil supply groove for supplying lubricating oil injected into an injection hole of the boss to a recess or a hole formed in the bush, penetrates either one surface of the bush or through the bush. The journal bearing according to claim 1, wherein the journal bearing is formed on the inner surface of the boss. 3. The bush is formed with a plurality of circular depressions or holes for retaining lubricating oil and a branch-like depression or hole communicating with the plurality of circular depressions or holes. 3. The journal bearing according to claim 1, wherein a longitudinal direction of the journal bearing has a predetermined angle with respect to a rotation direction of the journal shaft. 4. The bush has an inner member having a recess or a hole formed therein for holding lubricating oil, and a lubricating oil injected into an injection hole of the boss is formed into a recess or a hole formed in the inner member. The journal bearing according to any one of claims 1 to 3, wherein the journal bearing is press-fitted into an external member having an oil supply groove for supply.